CVE-2026-78902 Cross-site scripting in n/a
An attacker can execute arbitrary code via Cross Site Scripting in the pfBlockerNG package of pfSense.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-78902?
CVE-2026-78902 is a medium-severity cross-site scripting vulnerability in n/a, published on 25 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
Cross Site Scripting vulnerability in Netgate pfSense 26.03.1-RELEASE allows an attacker to execute arbitrary code via the pfBlockerNG package
Weakness: CWE-79
Which versions are affected by CVE-2026-78902?
How do I fix CVE-2026-78902?
No fix has been published for CVE-2026-78902 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-78902 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-78902 exists.
Sources
Also known as GHSA-c2hj-8667-88fr.